Add to help note about --xml option
Export comments and whitespaces to XML

It is needed to properly transfer all comments and special formatting to ruby code.
Add to tokens comments and whitespaces if Y2EXPORTCOMMENTS is set

it is needed for exporting comments from ycp code to ruby one. It is enclosed in
env variable to avoid performance regression in common run.
Add exporting comments and whitespaces to parser

It includes disabling of const optimalization when Y2EXPORTCOMMENTS is set
otherwise we loose comments inside constant maps and lists.
clean comments feature as suggested by @mvidner
Merge branch 'master' into lexer_comment_final
changes and version release
update gitignores to match properly
Merge pull request #23 from yast/lexer_comment_final

Lexer comment final