mappings/DwC2-VegBIEN.specimens.csv: Reversed XPaths so that they start with location instead of specimenreplicate

README.TXT: WinMerge setup: Documented how to get to Compare Options page

README.TXT: WinMerge setup: Added step to set Whitespace to Ignore change

README.TXT: Moved WinMerge setup to separate section. Changed Moved block detection link to the Configuration page.

mappings/VegX-VegBIEN.stems.csv: Expanded {} expressions using expand_braces, so that each distinct output for the same input is on its own line, improving readability. This will also help enable search-and-replace reversing of XPaths for the re-rooting to location.

mappings/VegX-VegBIEN.stems.csv: VegX XPaths: Expanded {} expressions using expand_braces, so that later use of expand_braces on the file would not affect the VegX output mappings of the inputs' via maps (VegX.organisms.csv, etc.)

mappings/DwC2-VegBIEN.specimens.csv: Expanded {} expressions using expand_braces, so that each distinct output for the same input is on its own line, improving readability. This will also help enable search-and-replace reversing of XPaths for the re-rooting to location.

README.TXT: Accepting test cases: Documented that when refactoring mappings, it's helpful to use WinMerge to detect moved lines

expand_braces: Fixed bug where needed to get next line from stdin in raw mode, so that \ won't be parsed as escape chars

join: Fixed bug where when an input to mapped to multiple outputs, the joined row for each output needed to be output separately using writer.writerow()