MAX_NESTING_LEVEL was only checked in parser.c, so
yaml_parser_scan() callers had no depth protection.
Deep flow nesting caused O(n²) CPU via simple_keys
scanning. Add the limit check in the scanner's
yaml_parser_increase_flow_level() and a test.
No recursive make anymore
Remove MY_LD_LIBRARY_PATH and friends
This is now done by the wrapper script
Remove LIBYAML_DIR variable
not needed anymore
Merge ReadMe.md files to one