Speculative data for some cancelled bomber projects
Added artwork for Elswick and Southampton bombers
Added lines for Elswick & Southampton into .sav.in typeblocks
abd.sav.in: fix target number mismatch
abd.sav.in: fixup bomber types in Bombers block (no Souths or Elswicks added)
stats/hsave: handle #comments
graphs: change colours for new bombertypes
Handle missing bombertype description
stats/losstypegraph: fix the colours
Merge branch 'master' into xbombers (contents: install instructions)
Merge branch 'master' into xbombers

Conflicts:
	dat/bombers
	save/abd.sav.in
	save/civ.sav.in
	stats/losstypegraph.py
	stats/prodlossgraph.py
	stats/valuegraph.py

Also fixed up:
	stats/extra_data.py
art: Selkirk and Windsor bombers
Enable the Windsor and Selkirk bombers
stats: extra_data for Windsor and Selkirk bombers
Flavour text for the Windsor and Selkirk
Merge branch 'master' into xbombers

Conflicts:
	dat/bombers
Update the .sav.in files for Selkirk and Windsor
Merge branch 'master' into xbombers
upconvert: skeleton of a script to upconvert savegames
Merge branch 'master' into xbombers (preparing for forward-merge)