partial port of copy_to to lines-as-cell-array
split out mystrjoin for other use
python_cmd: take loc test
port more to loc
loc helpers, write, indent
ipc: port vars_from to loc
python_cmd: with loc, more tests pass

other testing code cleanup
ips: port system to loc
ipc: fix system with dblquote in cmd or args
write_lines: call mystrjoin, move my Oct 3.6 perf testing there
ipc: sysoneline port to loc
ipc: sysoneline fix for file output (unused, debugging only)
ipc: system escaping newline (and others) fix
python_cmd: more escaping tests
ipc: minor refactor
extractblock: remove extra outer cell array
mystrjoin: helper fcn for older <+ 3.6 octave

had this in various places, centralize a bit.
Use strjoinnif available.
ipc: fix system on win32 by using sysoneline, clean-up drv logic
evalpy: use loc
Merge remote-tracking branch 'origin/master' into lines

Conflicts:
	inst/private/python_ipc_popen2.m