* the \B and \b regex anchors
* correctly repaints things when multiline regexes with identical
start and end are involved
* fixes a crash with zero-length regex matches
* does replacements at the edges of a marked region right,
* displays at most three warnings at startup
* documents the ability to read a file from standard input
OBS-URL: https://build.opensuse.org/package/show/editors/nano?expand=0&rev=63
