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-beancount.md

@@ -0,0 +1,153 @@
+# Beancount
+
+http://furius.ca/beancount/doc/syntax  
+http://furius.ca/beancount/doc/cheatsheet  
+
+## Basic example
+
+    ; a comment
+
+    2016-01-01 open Assets:Checking
+    2016-01-01 open Equity:Opening-Balances
+    2016-01-01 open Expenses:Groceries
+
+    2016-01-01 txn "set opening balance"
+       Assets:Checking         500.00 USD
+       Equity:Opening-Balances
+
+    2016-01-05 txn "farmer's market"
+       Expenses:Groceries     50 USD
+       Assets:Checking
+
+All referenced accounts must have an open directive.
+
+## Comments
+
+    ; comment
+
+Any unrecognised line is also a comment
+
+## Basic transactions
+
+    DATE txn [["PAYEE"] "DESCRIPTION"]
+       ACCOUNT    AMOUNT
+       ACCOUNT    [AMOUNT]
+
+DESCRIPTION must be in double quotes, can be multiline.
+No need for two spaces between account and amount.
+
+## Dates
+
+    YYYY-MM-DD
+    YYYY/MM/DD
+    YYYY.MM.DD
+
+Only YYYY-MM-DD with 8 digits is officially supported.
+
+## Account names
+
+    TOPACCT[:SUBACCT[:...]]
+
+    Income:Salary
+    Liabilities:CreditCard:CITI-1234
+    Assets:House
+
+Top level account must be one of Assets, Liabilities, Equity, Income, Expenses.
+Each subaccount must be capitalised.
+Letters, digits and hyphen are allowed (no spaces).
+
+## Amounts
+
+    QUANTITY COMMODITY
+
+    10USD
+    1000.0001 USD
+
+COMMODITY is all capital letters, on the right, and required .
+Decimal point is . (period).
+Digit group separator , (comma) is allowed and ignored.
+
+## More transaction features
+
+    DATE [txn|FLAG] [["PAYEE"] "DESCRIPTION"]
+       [FLAG] ACCOUNT       AMOUNT [PRICE]
+       ...
+       [FLAG] ACCOUNT       AMOUNT [PRICE]
+
+The txn keyword may be replaced by a FLAG.
+For just a payee, use `"PAYEE" ""`.
+
+## Prices
+
+`{LOTUNITPRICE[ / LOTDATE]}`
+and/or one of
+`@ UNITPRICE`,
+`@@ TOTALPRICE`.
+
+Lot prices are remembered and form distinct commodities, other prices are not.
+If there is both a lot price and a regular price, the latter records a market price.
+
+## Balance assertions
+
+    DATE balance ACCOUNT AMOUNT
+
+    2014-08-09 balance Assets:Cash 562.00 USD
+    2014-08-09 balance Assets:Cash 210.00 CAD
+
+Asserts the balance in this commodity,
+in this account, including subaccounts,
+at the start of this day.
+
+## Balance assignments
+
+## Directives
+
+    [DATE] KEYWORD ARGS...
+       [SUBDIRECTIVES]
+
+    DATE balance
+    DATE close
+    DATE commodity
+    DATE document
+    DATE event
+    DATE note
+    DATE open
+    DATE pad
+    DATE price
+    DATE txn
+    include
+    option
+    plugin
+    poptag
+    pushtag
+
+## account, open
+
+    DATE open ACCOUNT [COMMODITY[,...]] [METHOD]
+
+    2014-05-01 open Assets:Cash USD,CAD
+
+Every account posted to needs an open directive with prior date.
+
+## close
+
+    DATE close ACCOUNT
+
+## commodity
+
+    DATE commodity COMMODITY
+       [METADATA]
+
+    1867-01-01 commodity CAD
+       name: "Canadian Dollar"
+       asset-class: "cash"
+
+Attaches metadata to a commodity.
+
+## market price
+
+    DATE price COMMODITY AMOUNT
+
+    2014-07-09 price USD  1.08 CAD
+
+Also set by transaction prices.