strbuf_append_file() tolerates a starting buffer capacity of 0

fix return value of strbuf_append_file() when failed

doc fixup

header fixup

fixed bug in strbuf_terminate_views()

ASAN fault

wip

increase buffer size by a ratio

Merge remote-tracking branch 'origin/specify_quotes'

update docs

finished

works

wip

complete - need to update tests

wip