[FIX] Index: fixed Esa algs using TStackEntry type
[API] String: removed top() and topPrev(), added backPrev()
[FIX] Index: fixed algorithms using topPrev()
[API] String: renamed push_back() as appendValue(), top() as back(), pop() as eraseBack()
[FIX] Index: fixed build errors due to inconsistencies between string and stack interfaces
Merge pull request #6 from esiragusa/fix_index

Fixed index algorithms