Orbital Ion Cannon 1.5.2

New setting "Minimum Cannons Ready Before Auto-Targeting" that allows you to keep a buffer of ready-to-fire cannons that will always be available for manual targeting.
Removed "Verbose Messaging" option -- It is replaced by the new "Custom Alerts" option.
New custom alerts will trigger (if enabled in the mod options) whenever an ion cannon target is designated. These behave just like the alerts for destroyed structures et al.
Switched from using a train stop to show the ion cannon target location on the map to 0.15's new custom map marker feature.
New setting: "Map Marker Duration". This determines for how long the target map markers will remain after the ion cannon fires.
Reworked some text strings & added descriptions to the mod's technologies.