Integrate the patches contributed by Alon Gazit <along@mainsoft.com>.

Integrate the patches contributed by Alon Gazit <along@mainsoft.com>.

* BitVector32.cs (CreateSection): Check that the new
calculated offset isn't more than 32 and not that the sum of the
new offset and the number of set bits is more than 32.
(this): Perform bitwise and with the complement of the mask
shifted version (~(section.Mask << section.Offset)) and not with
the shifted version of the mask's complement (~section.Mask <<
section.Offset).
(this): Currently doesn't return the correct value when the data
in the BitVector32 instance is negative.

* ListDictionary.cs (CopyTo): If the array is null, it should
throw ArgumentNullException. If the index is less than 0, it
should throw ArgumentOutOfRangeException.
(Remove): Throw ArgumentNullException when the parameter is null.

* BitVector32Test.cs (TestNegativeIndexer, TestSectionIndexer,
TestCreateSection): new tests from Alon Gazit <along@mainsoft.com>.

* ListDictionaryTest.cs (CopyTo1, CopyTo2, Remove): New file, with
tests from Alon Gazit <along@mainsoft.com>.

svn path=/trunk/mcs/; revision=17885