g:trag#grep_type replaces g:trag_search_mode
g:trag_map_leader, TragInstallMap(), TragInstallKindMap(): Make it easier to set up maps
trag#GetGitFiles(): Use g:tlib#dir#sep, not the obsolete g:tlib_filename_sep
Rename most commands matching TRag* -> Trag*
trag#SetRepoFiles(): Use files in current VCS repo
trag#Grep(): Refactor to enable use of external grep commands
s:GetRx(): Return [posrx, filetype]
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