fpspreadsheet: Rename number format codes "nfCurrencyDash"/"nfCurrencyDashRed" to "nfAccounting"/"nfAccountingRed" and implement alignment of currency symbols as in Excel. Fix number format parser bug causing a failure in the corresponding test case.

git-svn-id: http://svn.code.sf.net/p/lazarus-ccr/svn@3080 8e941d3f-bd1b-0410-a28a-d453659cc2b4