- Moved passability flags from atom/var/flags to atom/var/pass_flags.

Currently there are three - PASSTABLE, PASSGLASS and PASSGRILLE. PASSTABLE - same as TABLEPASS, PASSGRILLE - can this atom pass through grilles and PASSGLASS - can this atom pass through windows, glass doors, etc. Most can_pass() procs were updated.
Added checkpass atom proc to check if this atom has certain pass_flag set.
- Added proc/sanitize_simple() and proc/strip_html_simple(). sanitize_simple does not html_encode the string and strip_html_simple does not sanitize it. Additionally, sanitize_simple and sanitize can take associative list of key-val chars as second argument, where key is char to searh for and val is replacement.
- Added datum/gas_mixture/proc/return_volume() and datum/gas_mixture/proc/return_temperature().
- Added proc/tg_text2list() and proc/tg_list2text(). tg_list2text is slower then dd_list2text, but processes associative lists differently (it adds not the keys, but associated values). tg_text2list is somewhat faster then dd_text2list.
- Added proc/listclearnulls(), proc/difflist(), proc/intersectlist() and proc/uniquemergelist(). Check the code comments for more info.
- Mechs can hold 3 equipment pieces. Gygax can hold 4.
- Tweaked global_iterator CRASH report.
- Fixed mech pilot ejection if mecha was destroyed.
- Fixed mech fabricator process() waiting for sync() to finish.
- Fixed mech fabricator Topic() waiting for process_queue() to finish.
- Some bugixes related to global map and random sectors.

git-svn-id: http://tgstation13.googlecode.com/svn/trunk@1722 316c924e-a436-60f5-8080-3fe189b3f50e

code/FEA/FEA_gas_mixture.dm

@@ -93,6 +93,12 @@ datum
 					return total_moles()*R_IDEAL_GAS_EQUATION*temperature/volume
 				return 0
 
+			return_temperature()
+				return temperature
+
+			return_volume()
+				return max(0, volume)
+
 			thermal_energy()
 				return temperature*heat_capacity()