documented this script better.  added checking of pre-req ("remark") and automatic installation via regex-markup RPM.  Aleksey.
Remove Installing_and_Using_git -- this will be replaced by two separate slides: Installing, Using. Aleksey.
Remove 010-0001_Preface.__About_this_collection.txt
(it is replaced by 010-0010_Preface.__About_this_collection.txt)