Implement first_valid_page method in mleHeader class.
Add first_valid_page to debug output.
Implement mle_start_off function in mleHeader class.
Add mle_start_off to debug output.
Implement mle_end_off method in mleHeader class.
Add mle_end_off to debug output.
Implement capabilities method in mleHeader class.
Add capabilites to debug output.

This doesn't parse the capabilites structure, just dumps the uint32.
Implement cmdline_start_off method in mleHeader class.
Add cmdline_start_off to debug output.
Implement cmdline_end_off method in mleHeader class.
Add cmdline_end_off to debug output.