Changes since 8.13.12:

• move the sources to GitHub
• close a bit the glyph of the imperfectum time signatures (M:c)
• don't output log messages to stderr
• have smaller flag stubs in beams
• put the chord indications closer to the staves/notes

Fixes:

• bad x offset of P: when at start of line after a repeat bar
• don't put accidentals in the key signature at start of line
• build: bad building from .tar.gz or .zip
• build: fix warning in compiling parse.o
• build: install error