Mrcfile

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* Add support for passing file names as pathlib Path objects.

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* Add file names to mrcfile-header output
* Improvements to validation functions (mrcfile-validate command and the
mrcfile.validate() function):
* Add a message with the file name of each file processed, to enable valid
and invalid files to be identified.
* Add a message confirming that valid files are valid.
* Ensure that all files are processed when validating multiple files, even
if some are invalid or raise exceptions on opening.
* Add support for numpy 1.23 and Python 3.10 and 3.11

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* Change default MRC format version from 20140 to 20141 and update validation
to allow files with both format numbers as valid.
* Add mrcfile.read() and mrcfile.write() functions for quick one-off accesses
to the MRC data array without needing to keep an MrcFile object open (thanks
to Alister Burt).
* Allow the extended header to be set when creating a file with
mrcfile.new_mmap() (thanks to James Parkhurst).
* Add file size checks to avoid allocating huge amounts of memory when opening
corrupt or non-MRC files in permissive mode.
* Update numpy and Python version compatibility to drop support for Python
3.4 and 3.5 and numpy < 1.16, and add support for numpy 1.21 and 1.22.
* Fix bug intepreting FEI extended headers on big-endian hardware.
* Documentation updates.

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* Add support for the new proposed data mode 12 (numpy float16). Note that
this causes a change in behaviour: previously float16 arrays would be
widened to float32 and saved in mode 2; now they will be kept in float16 and
saved in mode 12, which could be incompatible with other software.
* Issue Python warnings if NaN or infinite values are found when a new data
array is passed to set_data() (or if update_header_stats() is called).
* Update numpy version compatibility to include numpy 1.20
* Minor updates to documentation

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* mrcfile is now available through conda-forge (thanks to Billy Poon)
* Add support for FEI2-format extended headers (thanks to Michael Saur)
* Add nstart property for convenient access to the header nxstart, nystart and
nzstart fields in the same style as the existing voxel_size property
* Read files without the final ' ' space in the map ID field (for example, as
written by MotionCor2) without errors
* Add help text for mrcfile-header and mrcfile-validate command line programs
* Fix bug in stats calculations when an empty array is passed to set_data()
* Update Python and numpy version compatibility. Now works with Python 2.7
and 3.4 - 3.9, and numpy 1.12 - 1.19
* Minor updates to documentation

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* Fix incompatibility with numpy 1.16 by reading files into mutable bytearrays
instead of immutable bytes objects. Note this will cause slower reading of
bzip2-compressed files on Python 2 because Python 2's bz2 module does not
support reading directly into a bytearray and therefore the data must be
copied.
* Check that the file is large enough when reading the extended header.
(Previously, the size was only checked for reading the data array.)