Replaced RCS parser code with new rcsparse.{c,h}:
- be very strict about things we parse
- print more information about errors if they occur
- do not fatal() directly in parser, give caller a chance

Replaced RCS parser code with new rcsparse.{c,h}:
- be very strict about things we parse
- print more information about errors if they occur
- do not fatal() directly in parser, give caller a chance to react
- fix an rcs design issue when it comes to login names

tested by many on tech@

ok xsa

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