MATLAB: add logging initialization function

[sbesson]

Fixes #2233

This PR addresses the issues reported in #2233 by:

• adding a MATLAB function initializing the logging system with a logic similar to logging.basicConfig.
• set the default logging level to WARN if no argument is passed
• use this logging initialization function in bfopen to prevent logging set by the user to be overriden
• add some logic checking whether logging is enabled to loci.common.DebugTools

To test this PR:

• try the following workflow from a clear MATLAB session using the test artifacts:

  % Open an image - logging should be initialized at WARN level
  data = bfopen(id);
  % Check whether logging is enabled
  loci.common.DebugTools.isEnabled()
  % Set the logging level to debug
  loci.common.DebugTools.enableLogging('DEBUG');
  % Open the image again - logging should be at DEBUG level
  data = bfopen(id);
  

• check the new MATLAB tests are passing

• check bftest.m completes as expected in the CI job and that the individual workers in the parfor loop have their logging system properly intialized.

[bramalingam]

Works as expected,

>> c1 = bfopen();
log4j:WARN No appenders could be found for logger (loci.formats.FormatHandler).
log4j:WARN Please initialize the log4j system properly.
Reading series #1
    ...
>> loci.common.DebugTools.isEnabled()

ans =

     1

>> loci.common.DebugTools.enableLogging('DEBUG');
>> c1 = bfopen();
TiffDelegateReader initializing /Users/bramalingam/Desktop/myfile.tiff
TiffDelegateReader initializing /Users/bramalingam/Desktop/myfile.tiff
loci.formats.in.TiffDelegateReader.initFile(/Users/bramalingam/Desktop/myfile.tiff)
TiffReader initializing /Users/bramalingam/Desktop/myfile.tiff
loci.formats.in.TiffReader.initFile(/Users/bramalingam/Desktop/myfile.tiff)
Reading IFDs
Populating metadata
Checking comment style
Populating OME metadata
Expected positive value for PhysicalSize; got Infinity
Reading series #1
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..
Location.mapFile: embedded-stream.raw -> null
Location.mapFile: embedded-stream.raw -> null

Good to merge, if the code changes suggested by @jburel are taken care of..

[sbesson]

@bramalingam / @jburel: pushed.

[mtbc]

whether

[jburel]

a typo missed by @mtbc ;-): intializes

[sbesson]

Fixed the typo reported in d76bc0c. Assuming there are no more functional comments and since the merge jobs are green, I propose to merge this PR to unlock this follow-up logging work addressing http://trac.openmicroscopy.org/ome/ticket/13151.