6900757: minor bug fixes to LogCompilation tool Summary: improve internal error reporting (point to XML element causing trouble); fix comparator for sorting by name and start; make tool more robust wrt. incorrect options and files not found; make inlining decision output more clear; adopt uncommon traps history printing; properly mention compiler in generated logs; add options for printing time stamps and omitting compilation IDs; add option for comparing compilation logs; overall code cleanup and API documentation Reviewed-by: kvn, vlivanov

^build/
^dist/
^webrev
/nbproject/private/
^src/share/tools/hsdis/build/
^src/share/tools/IdealGraphVisualizer/[a-zA-Z0-9]*/build/
^src/share/tools/IdealGraphVisualizer/build/
^src/share/tools/IdealGraphVisualizer/dist/
^src/share/tools/IdealGraphVisualizer/nbplatform/
.igv.log
^.hgtip
.DS_Store
\.class$