double underscore. Added #includes for dependent files.
* popt.c: Likewise.
* popthelp.c: Likewise.
* tree.c: Moved a macro from tree.h to here, as it is useless
outside tree.c.
never set to VISIBLY. Adjust all dependencies. Eliminate hack
with "clear_now" - it causes invalid memory access and hides the
real problem.
* util.c (strip_ctrl_codes): Fix possible invalid memory access
if the escape sequence ends unexpectedly.
was broken. Secondly, every developer should be able to add
this code when needed. Finally, there is no need to expose the
option to the user and translate it into 30 languages.
* subshell.h: Remove debug_subshell.
* subshell.c: Likewise.
