[ref] statusbar, rm get_finfo(), MAX macros

[ref] statusbar, rm get_finfo(), MAX macros

- remove statusbar "show variables" (user manual edit status string)
- merge get_finfo() in print_status()
- rename td to dt (datetime)
- CURSOR instead of CURSOR_NAME
- add new MAX macros:
	- MAX_STATUS	255	max status bar
	- MAX_LINE	4096	max draw line
	- MAX_USRN	32	max username
	- MAX_GRPN	32	max groupname
	- MAX_DTF	32	max datetime format