0.6.22

This release fixes a few issues:

• addresses a lingering issue with unsynchronisation: when the last frame in an ID3v2.{3,4} tag ends in 0xff, and there is no padding, that should be treated as a false sync.
• normalizes assorted creation flags (for both frames and tags) among the sub-commands xtag, genre, popm and text.
• extends the text sub-command to operate on ID3v1 tags, if they're present and the frames being updated map naturally to an ID3v1 field.
• closes issue 2
• Beginning with glibc 2.4, the constant SIGSTKSZ is no longer a constant. Update main() to malloc the signal handler stack rather than allocating it on the stack.