Enable float pickling/unpickling
doc: hide instructions for building as static module

Reason: The text begins with "This feature does not work
in this version of the package."
Prepare release
PackageInfo.g: set IsMaintainer to false for Max N.
doc: change README to point people to GitHub issue tracker
doc: link to issue tracker from manual
Fix release date
Merge HISTORY and CHANGES
build: make the 'doc' target generic
Version 4.3.1
Update Max' contact data
Tweak CHANGES file for release automation
Cache obs when IO_Pickling, to avoid multiple objects having the same value for IO_MasterPointerNumber
Merge pull request #11

Conflicts:
	CHANGES