Update fps_create.c

[a-sevin]

Could we put the datadir and confdir of a FPS in /tmp ?

[DasVinch]

Need to do an intention check with @oguyon as to the purpose of confdir and datadir. I may be 100% confused.
As I understand it they need to be persistent, at least for now:

• confdir --> stores user-made modifs to FPS tree, and is used upon redeploy after a cleanup / reboot
• datadir --> stores data products from the execution (mostly of one-shot FPSs, e.g. mlat, calibs). From a milk PoV, data output should stay there, and it's up to scripts of a higher layer to process / extract useful files and "upgrade" these to the conf folder.

[oguyon]

confdir and datadir are indeed intended to be persistent (across computer reboots), so we don't want them to go in a tmp folder. @a-sevin what is the motivation for moving them to tmp directory ?

[a-sevin]

ok ok, just void the creation of a lot of directories close to our binaries :)

[oguyon]

OK. The rundir could be a symlink to tmp. This would be the easiest. We wouldn't make the default.

[a-sevin]

No problem, I handle it on my side.

Have a happy holiday season !