ENH: remove obsolete ifort flags, ensure generated binaries work everywhere.
Fix for astype('S') string truncate issue

Calling astype('S') for an array of string objects results in a string array where dtype='S64', even if the original string objects are longer than 64 characters. Add call to GetParamsFromObject() to determine maximum string object length, and use that as string dtype size.
MAINT: Update INSTALL.txt after dropping Python 2.4, 2.5.

Make the required Python versions >= 2.6 or 3.2. Remove text specific
to earlier Python versions.
Add support for unicode strings
MAINT: Improve INSTALL.txt wording and wrap lines at 75 characters.
Add tests for strings shorter than 64 characters
Merge pull request #3271 from charris/maint-update-install-txt

MAINT: Update INSTALL.txt after dropping Python 2.4, 2.5.
Merge pull request #3270 from ContinuumIO/astype_fix

Fix for astype('S') string truncate issue
Merge pull request #3272 from cournape/remove_obsolete_ifort_flags

ENH: remove obsolete ifort flags