remove references of non-existent include file
Adjust help messages

Use SELECTION as type if selection flag on
Use KEYWORD as type for constant definietions
Define owner per command execution
If no SELECTION but keywords it shows "enter a value ..."
fix segmentation fault if 'flcl help conv'
Rename HOMEDIR/CUSERID in homedir/userid
Rework cuserid and homedir implementation
Correct syntax halp for CHGPROP