Valentina for Ruby MAC Improved

We have improved Valentina for Ruby v4 on MAC.

Now we have single UB module vruby_fat_release.dylib instead of two _ppc_ and _i586_. This still perfectly works with Ruby.

The WIKI pages about MAC INSTALL are corrected and updated.

We corrected the Valentina.rb adapter to reflect changes in the SHOW commands in v4, which now produce cursor with columns that have prefix ‘fld_’