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-hledger.md

@@ -0,0 +1,124 @@
+# hledger
+
+http://hledger.org/journal.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
+
+    ; comment
+    # comment
+    * comment and org-mode outline node
+
+## Basic transactions
+
+    DATE [DESCRIPTION]
+       ACCOUNT    AMOUNT
+       ACCOUNT    [AMOUNT]
+
+Non-comment lines may end with a comment.
+Indented comments are attached to the preceding transaction or posting.
+
+## Dates
+
+    YYYY-MM-DD
+    YYYY/MM/DD
+    YYYY.MM.DD
+    MM-DD
+    MM/DD
+    MM.DD
+
+## 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"
+    1.000.000,01
+    12,34,567.89
+
+Decimal point is .  or , (period or comma).
+Digit group separator is ,  or . (the one not used for decimal point).
+Any digit grouping can be used, not just thousands.
+
+## More transaction features
+
+    DATE [FLAG] [(CODE)] DESCRIPTION
+       [FLAG] ACCOUNT  AMOUNT [PRICE] [=BAL]
+       ...
+       [FLAG] ACCOUNT  AMOUNT [PRICE] [=BAL]
+
+## Prices
+
+One of
+`@ FIXEDUNITPRICE`
+`@@ FIXEDTOTALPRICE`
+and/or
+`{=FIXEDLOTUNITPRICE}`.
+
+These do not record market prices.
+The lot price syntax is ignored.
+
+## Balance assertions
+
+`= AMOUNT` after posting amount & price.
+
+Asserts the balance in this commodity,
+in this account, excluding subaccounts,
+on this day. Same day events are processed in parse order.
+
+## Balance assignments
+
+## Directives
+
+    KEYWORD ARGS...
+
+    account (alias for apply)
+    alias
+    apply
+    comment
+    D
+    end
+    include
+
+## account, open
+
+## close
+
+## commodity
+
+## market price
+
+    P DATE [TIME] COMMODITY UNITPRICE
+
+    P 2015/8/9 GBP $1.55
+
+Used by -V.
+A time is ignored.