dev
replace PTDNF_CMD_OPT with llconf nodes
make sslcacert, sslclientkey, sslclientcert gloabl settings
tree-wide: remove out dated author info from source files
use cnftree for setopts
Refactor instance lock code
Harden TDNF build by enforcing various GCC build flags
Fix a plausible mem leak during realloc
fix compile errors that came up with PR 542
Pressing a plain enter should not break the prompt