doc: change download list back to github

doc: change download list back to github

bugfix: call zlog_clean_rest_thread in exit() mutilple times

version: 1.2.10 bugfix & LGPL v3 -> LGPL v2.1

version: the real 1.2.9, fix another bug from buf.c when input is lon…

…ger than buffer size

some bugfix.

gcc __attribute__ to check format compatible with arguments.
support \# comment in line

code: add zlog version, kick git hash away

bugfix: the last fix for check for time cache is not correct

still HardySimpson#13

doc: remove %D in doc and test*.conf

bugfix: let OS release zlog_thread_t when thread exit, simple zlog_re…

…load() and zlog_fini()