v0.15.1 - some fixes

Changes:

• viewing polls in historical mode is disabled.
• some issues with awkward values in qdisplays have been resolved.
• all advisor timers are now 6 months.
• clarifying Woytinsky’s action for adopting the economic plan in historical mode.

Future plans:

• mod loader? more tools for compiling dendrynexus games?
• preparing for Steam release