Fixed documentation typo; lexers/lexer.lua
Changed URL for stats; doc/.header.md
Condensed manual and API documentation into single files.

--HG--
rename : doc/01_Installation.md => doc/manual.md
Updated header links; doc/.header.md
Updated header links to be relative when possible; doc/.header.md
Updated to Scintilla 3.4.4.

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extra : rebase_source : dddd46cbd72e224f04912a896e832a7a9d28e7d0
Fixed heredoc highlighting; lexers/bash.lua

--HG--
extra : rebase_source : d101f686d38654d96ed2407040266721cec7e16f
Updated CHANGELOG.md.
Fixed links.
Added tag scintillua_3.4.4-1 for changeset 5aedcd8bfe5f
Updated tags; .hgtags
Removed tags for Textadept versions since Textadept 7.5 will start keeping track
of Scintillua versions.
Updated to LPeg 0.12.
Needed to replace `lpeg.P(function())` patterns with `lpeg.Cmt()` in order to
avoid "loop body may accept empty string" LPeg error.
`lpeg.P(function())` is a match-time capture and LPeg 0.12 treats them as
"nullable" (can match the empty string).
Code cleanup.