LINUX
* Added a mount plugin for Linux.
* Added the moddump plugin.
* Added classes to represent a File and a Mountpoint.
* Added the mfind and mls plugins to interact with mounted filesystems.
* Added a yara plugin for Linux.
* Slightly improved output of check_idt for Linux.
* Updated the cpuinfo plugin to work on 3.X kernels and report data for each processor.
* Fixed timespec bugs. as_datetime now reports the correct time.
* Made lsmod a tad more resilient to smear.
* Fixed inet_sock to work with newer kernels.
* Fixed an issue with procdump.

WINDOWS
* Reduced code in yarascanner.

MISC
* Fixed the name of the VTxPagedMemory AS.

BUG=
R=scudette@gmail.com

Review URL: https://codereview.appspot.com/101760048
* Added a structs plugin - helps to inspect unknwon allocations in memory by
      finding their pool tags.

    * Started implementing an autodetection system for undocumented win32k gui
      structures using the above.

    * Fixed a bug with demandling which reveals more function names. Will need to
      rebuild the profile repository.

    * Fixed a bug with callable overlays which accidentally ignored the callable if
      it happened to raise AttributeError.

    * Various other small fixes.

BUG=
R=amoser@google.com

Review URL: https://codereview.appspot.com/96620043
Removed remaining traces of kdbg fallbacks.