[Lock] add safeguards for network/distributed file systems

[johntruckenbrodt]

• wait some time for the target's parent directory to exist
• if soft=True, wait for the target to exist (and use this in pyroSAR.gamma.util.convert2gamma)
• retry "touching" lock files for some time to avoid errors like this:

      Path(self.lock).touch(exist_ok=False)
    File "pathlib.py", line 1303, in touch
      fd = os.open(self, flags, mode)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  FileNotFoundError: [Errno 2] No such file or directory: '*.lock'
  

[coveralls]

Pull Request Test Coverage Report for Build 21672019192

Details

• 33 of 44 (75.0%) changed or added relevant lines in 2 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+0.1%) to 54.048%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pyroSAR/gamma/util.py	0	4	0.0%
pyroSAR/ancillary.py	33	40	82.5%

Files with Coverage Reduction	New Missed Lines	%
pyroSAR/gamma/util.py	1	5.05%

Totals
Change from base Build 21667674295:	0.1%
Covered Lines:	4019
Relevant Lines:	7436

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💛 - Coveralls