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Substantial rewrite of etags regexp option text.

Clarify that the @regexfile contains the arguments to a --regex= option.

Clarify that the `m' modifier pertains to a single regular expression.

Merge the two places where the {language} prefix was described.

New {language} and @regexp features.

Document new default keywords for TeX.

that of Emacs, remove the references to the interval operator, which is
now part of Emacs as well as Etags, and add references to greedy
operators and shy groups, which are now part of Emacs, but not of Etags.

notice in a change log file.