start converting the quickref to separate files

An experimental plan for easier maintenance. There will be one linear
quickref-NAME.md file per ledger-like, with similar headings and
content across all quickref files. A script will take the sections and
tabulate them nicely to give a layout like the current page. And
perhaps there'll be some javascript to show/hide each format.

quickref/quickref-ledger.md

@@ -0,0 +1,205 @@
+# Ledger
+
+http://ledger-cli.org/3.0/doc/ledger3.html#Journal-Format  
+http://ricostacruz.com/cheatsheets/ledger.html  
+
+## Basic example
+
+    ; a comment
+
+    2016/1/1 set opening balance
+       assets:checking       $500.00
+       equity:opening balances
+
+    2016/1/5 farmer's market
+       expenses:groceries     $50.00
+       Assets:checking
+
+Comments, directives, and/or transactions in any order.
+
+## Comments
+
+    ; comment
+    # comment
+    % comment
+    | comment
+    * comment and org-mode outline node
+
+Non-comment lines may end with a comment.
+Indented comments are attached to the preceding transaction or posting.
+
+## Basic transactions
+
+    DATE [DESCRIPTION]
+       ACCOUNT    AMOUNT
+       ACCOUNT    [AMOUNT]
+
+A transaction contains any number of indented postings (usually two), whose amounts must sum to zero.
+At least two spaces required between account and amount.
+One amount may be omitted.
+
+## Dates
+
+    YYYY-MM-DD
+    YYYY/MM/DD
+    YYYY.MM.DD
+    MM-DD
+    MM/DD
+    MM.DD
+
+Other formats allowed if specified with `--input-date-format`.
+
+## Account names
+
+    TOPACCT[:SUBACCT[:...]]
+
+    Revenues:Salary
+    liabilities:credit card:CITI 1234
+    other assets:house
+
+Account names begin with a letter.
+May contain single spaces.
+May contain subaccounts separated by : (colon).
+
+## Amounts
+
+One of
+`COMMODITY QUANTITY`,
+`QUANTITY COMMODITY`,
+`QUANTITY`.
+
+    10
+    $10.00
+    1,000.0001 USD
+    10 "prepaid classes"
+
+COMMODITY is a symbol, word or phrase; if it contains spaces or numbers, it must be in double quotes.
+It can be on the left or right, with or without a separating space.
+QUANTITY is a number with 0 or more decimal places.
+Decimal point is . (period).
+Digits can be grouped into thousands by , (comma).
+Amount styles influence the standard display style for each commodity.
+
+## More transaction features
+
+    DATE [FLAG] [(CODE)] DESCRIPTION
+       [FLAG] ACCOUNT  AMOUNT [PRICE] [=BAL]
+       ...
+       [FLAG] ACCOUNT  [AMOUNT [PRICE] [=BAL]]
+
+FLAG (aka STATE) is empty, ! or * meaning uncleared, pending or cleared
+CODE is any string, in parentheses
+DESCRIPTION can be a payee name, narration, or both
+
+## Prices
+
+One of
+`@ UNITPRICE`,
+`@@ TOTALPRICE`
+and/or one of
+`{LOTUNITPRICE}`,
+`{=FIXEDLOTUNITPRICE}`
+and/or
+`[LOTDATE]`.
+
+A UNITPRICE or TOTALPRICE also records a market price on this date.
+A LOTDATE is written in square brackets.
+
+## Balance assertions
+
+`= AMOUNT` after posting amount & price.
+
+    2016-03-10
+       Expenses:Food      $20
+       Assets:Cash       $-20 = $80
+
+Asserts the balance in this commodity,
+in this account, excluding subaccounts,
+at this point in the parse order.
+
+## Balance assignments
+
+`= AMOUNT` with no preceding/inferred posting amount.
+
+    2012-03-10 Adjustment
+       Assets:Cash            = $50
+       Expenses:Misc 
+
+Sets the posting amount so as to make the balance assertion true. (The other amountless posting allows the transaction to balance).
+
+## Directives
+
+    KEYWORD ARGS...
+       [SUBDIRECTIVES]
+
+    account 
+
+    alias
+    apply
+    assert
+    bucket
+    capture
+    check
+    comment
+    commodity
+    define
+    end
+    expr
+    fixed
+    include
+    P 
+
+    payee
+    tag
+    test
+    year
+
+    Timeclock directives:
+    i
+    o
+    b
+    h
+
+## account, open
+
+    account ACCOUNT 
+       [SUBDIRECTIVES]
+
+    account Revenues:Salary
+    account Expenses:Food:Chicken
+       note chicken food expenses
+       alias food
+       payee ^(KFC|Popeyes)$
+       check commodity == "$"
+       assert commodity == "$"
+       eval print("Hello!")
+       default
+
+Gives more error checking with --strict  or --pedantic.
+Optional subdirectives do more stuff.
+
+## close
+
+## commodity
+
+    commodity COMMODITY
+
+    commodity EUR
+    commodity $
+      note American Dollars
+      format $1,000.00
+      nomarket
+      default
+
+Gives more error checking with --strict  or --pedantic.
+Optional subdirectives do more stuff.
+
+## market price
+
+    P DATE TIME COMMODITY UNITPRICE
+
+    P 2004/06/21 02:18:02 AAPL $32.91
+    P 2004/06/21 02:18:02 AU $400.00
+
+Used by -V and -X.
+Also set by transaction prices.