[Ohrrpgce] SVN: teeemcee/11668 physpeak: merge error messages with the same lexpos; fix some error mess

[subversion at HamsterRepublic.com]

teeemcee
2020-03-31 07:42:13 -0700 (Tue, 31 Mar 2020)
294
physpeak: merge error messages with the same lexpos; fix some error messages

I'd like to do more than this, and combine messages with different carets

Replaced "expression : STRING" with "expression : error STRING", and
removed a couple error messages that are redundant tothe automatic ones.
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U   wip/physpeak/hs_lib/hs_ast.py
U   wip/physpeak/hs_lib/hs_parse.py
U   wip/physpeak/hs_lib/hs_parser_utils.py