explicit checks in common.c, dirstack.c, print title as h1 in base.tt, update README.md
add buffer_setempty(), optimize flow logic, rename enum value to BUFFER_PAIRS because I really don't mind newlines there...
according to buffer_setempty, add vartable_setempty, adjust function order and optimize flow logic
utilize new enum value BUFFER_PAIRS in htmlize, utilize new *_setempty functions throughout the code
remove buffer_ereplace and buffer_unescape. this went down a road I don't aim at
braces switch mode. keep it simple.
add buffer_tofile()
move markdown syntax towards a more uniform system. tagging tt77i version 1.0.0