refine the QNX IFS structure

Fix broken QNX4/6 detection

The previous QNX detection was erroneously using the QNX4 Boot block magic, but labelled QNX6. 
This PR fixes the labels and add the proper QNX6 Super Block magic, known as QNX6_SUPER_MAGIC.

For further details see: 
https://www.forensicfocus.com/Forums/viewtopic/t=16846/
https://github.com/torvalds/linux/blob/6f0d349d922ba44e4348a17a78ea51b7135965b1/include/uapi/linux/magic.h#L49
https://github.com/torvalds/linux/blob/master/fs/qnx6/inode.c

fix issue #343

Support for IDA versions >= 7.0

More Informative README.md

Updated README.md to be more informative

Minor update to README.md

Fixed image not found on sometimes travis status m added header and updated existing headers to subheaers

Modified extractor to report the actual extractor command that was executed, rather than the placeholder command in the extract.conf file.

Typo: Microchop --> Microchip

Use internet archive to revive dead link

MPFS (Microchip PIC File System)

Starting with IDA 7.0, the use of the Actions API is mandatory.
This enables Binwalk IDA plugin support for users of IDA versions 7.0+ without any compatibility changes for users of versions >= 3.95

Add support for extracing into subdirectories named by the offset.