Convert (Squeak) tabs to (Smalltalk/X) spaces in method sources ...when loading and other way round when saving. Historically, Squeak world uses tabs to indent source whereas Smalltalk/X uses (four) spaces. This is a pain when one works on code that is meant to work in both, Smalltalk/X and Squeak (family). In an attempt to ease that pain, tabs are converted when loading / saving the method. We'll see how it goes.

Do not cache `MCDefinition`s since it only makes loading slow.

Allow adding / removing Monticello repositories in settings even if Monticello is disabled ...as in browser menus.

Allow reading an extra instvar for `MCSnapshot` and `MCMethodDefinition` Recent Pharo (8 and later) adds an extra instvar to `MCSnapshot` and `MCMethodDefinition`. The code below just ignores the extra instvar, allowing us to read these .mcz while producing .mcz readable by Squeak. Whether this is a bug or another instance of 'nothing but Pharo matters' I do not know.

Fixed `MCSnapshot >> #options` to always return options ...and not `self`. Due to slip in lazy initialization, `self` was accidentally returned when `options` were not initialized.

Backed out changeset fa939598a32a Adding extra instance variables added by Pharo to `MCMethodDefinition` and MCSnapshot is a bad idea: it makes .mcz written back by Smalltalk/X unreadable by Squeak. This is certainly something we don't want. So, another way around has to be found.

Add utility method to export St/X package to Monticello repository

Regenerate build support files

Add missing instvars from Pharo implementation to MCSnapshot / MCMethodDefinition This allows loading Pharo-saved .mcz into Smalltalk/X without error and resorting to source fileout. Should be compatible with Squeak.

Fix source loading w.r.t. class comments