Update INSTALL.txt

Update INSTALL.txt

Checkpoint history rewrite

add DCA switch to track propagation function

add DCA switch to track propagation function

ALIROOT-6964 The variable size arrays were deleted, but the size was …

…not set to 0 which caused problems in Root IO. Fixed now + some cleanup

ALIROOT-6964 The variable size arrays were deleted, but the size was …

…not set to 0 which caused problems in Root IO. Fixed now + some cleanup

Using std::

adding GetPtHard option in Herwig

Revert "Update AMPT to version v1.26t7-v2.26t7"

This reverts commit 6732547.