#10 Regexp find & replace

[alsemm]

Need to integrate regexp library. It should tolerate malformed UTF8 data. PCRE doesn't bear malformed UTF8. Oniguruma (http://www.geocities.jp/kosako3/oniguruma/) is declared to support malformed UTF8. Need to try. Some default GUI dialogs to configure and run search should be provided. Find & replace should run asynchronously, so that not to block editor screen. User should be able to perform any r/o operation while "find & replace" runs. User should be able to abort operation. Forward and backward search should be supported. Support for cross-line match is not mandatory. Though it is very easy to support with regexp library that support iterators (boost::regexp?).