0tu when a soldier revives via Heal.

 - was already done for revive via Stimulant (copy code up)
Grenade activation warning messages.

 - shows red warning when activating grenades in Tactical. But...
   only works for Proxies in the preBattle equip screen (someone
   with more understanding of thinkers & timers might do it for the
   other grenades, on preTactical screen)

- 2 line change ( intended to replicate behavior of original )
Closes the inventory screen on RMB

 - only if *not* in preBattle screen! otherwise things get weird...
Remove path preview when using action menu or inventory

Fixes
- bug 253.
- using a medikit or psi-amp with a path previewed leaves that
inaccurate path on screen.
- accessing inventory with a path previewed leaves that potentially
inaccurate path on screen.
Update path preview when unit kneels
Add missing setup for tank only missions
Avoid code duplication
Merge pull request #637 from cfailde/tankonly

Add missing setup for tank only missions
Merge pull request #634 from cfailde/bug253

Remove path preview when using action menu or inventory
Merge pull request #633 from kevL/inv_exit_rmb

Closes the inventory screen on RMB
Merge pull request #631 from kevL/heal_revive_fix

0tu when a soldier revives via Heal.
Merge pull request #632 from kevL/gren_act_warn1

Grenade activation warning messages.
Flat rate for weapon shots.
UI cleanup
Woo sliders!
Portuguese update
Improved custom resource handling
Woo sliders!!!
Stop adding visible unit buttons after tenth enemy
Further visible enemy button tweaks