Move, rename, and fix base_total_bulbs_required() to
research_total_bulbs_required(). Now the call to this
function returns the same value for the same research,
taking in account correclty tech leakage,
EFT_TECH_COST_FACTOR and AI tech cost reduction.

See gna bug #22059

git-svn-id: svn://svn.gna.org/svn/freeciv/trunk@25492 a0f10bec-cc02-0410-94fc-a9cfff90b4cd
Put paragraph breaks between paragraphs of ruleset terrain help.

See gna bug #22300.

git-svn-id: svn://svn.gna.org/svn/freeciv/trunk@25493 a0f10bec-cc02-0410-94fc-a9cfff90b4cd
Fully document road and base build times and bonuses in automatic help.
Add missing road descriptions to rulesets.

See gna patch #3405.

git-svn-id: svn://svn.gna.org/svn/freeciv/trunk@25494 a0f10bec-cc02-0410-94fc-a9cfff90b4cd
Added target "snapshot" to Windows installer Makefile

See patch #4916


git-svn-id: svn://svn.gna.org/svn/freeciv/trunk@25498 a0f10bec-cc02-0410-94fc-a9cfff90b4cd
In alien ruleset, cities of Adventurers can grow one size bigger than
the restrictions would otherwise allow.

See patch #4848


git-svn-id: svn://svn.gna.org/svn/freeciv/trunk@25501 a0f10bec-cc02-0410-94fc-a9cfff90b4cd