Modify makefile to work with DKMS.  Apparently DKMS silently fails if you try to rearrange the source tree.

Build is now back to being in-place, but properly cleans up!

(timespec_sub, timespec_add)

 * Removed copies of checkFileCrc from the epics sequencer, standalone_edc, and sdf_monitor.c
 * Updated the logic in checkFileCrc to return -1 when the file name is NULL or the file cannot be opened
   * as per documentation.

Adding beter log messages when module is in verbose mode, removing extra shmem cleanup, removing newline at end of VIO shmems, and adding error message when mbuf_probe delete fails

 * Clarify the code and the roles of fields by using a specific duration type.

Update gpstime.c to make the main path for getting time w/o a timing card lock free until a pause is requested.

 * An aid for debugging user space programs that use gpstime.
 * Adds ioctls to the gpstime drive to pause/resume/step
 * Only works when system time is being used.
 * Adds entries to sysfs to show state of the clock and to query/set the step size.
 * Adds a utility program gps_module_utils which can pause/resume/step the time.

Removing the unneeded ExtraSymbols.symvers and cleaning up the FE makefile so it builds on debian 11

Adding volatile for memory mapped IO, adding function for kernel space timespec retrieval and adding test for the gpstime module

Cleaning up findSharedMemory usage, fixing error checks on the returned pointer, consolidating code for findSharedMemory() and findSharedMemorySize() so we don't have duplicate, removing unused sprintf in both functions