draw_ram_indicator() easier numbers to read, includes RAM just collected

[jdlcdl]

Description

The idea here was twofold:

• easier free RAM numbers to read (between 1 and 1023) usually 3 digits of precision with K or M to see the big picture,
• remember amount of free RAM before gc.collect() frees it so that we can see how much was recently collected... but this will not always be true if there is a habit of using gc.collect() within routines that are memory-costly.

Since there will be loops that absolutely require gc.collect(), perhaps we can make a habit of doing it like:

pre_collect = gc.mem_free()
gc.collect()
print("%s has collected %d bytes" % (__name__, gc.mem_free() - pre_collect))

...so that we can at least see how much memory had been used and that gc.collect() freed it for x times for this routine? Otherwise, a bad habit of collecting memory even when it's not necessary may become the norm?

Alternately, I wonder if we might never gc.collect() except where we are absolutely sure it's necessary... and then more generally use try/except "MemoryError", then do gc.collect() within the except block, and continuing on?

What is the purpose of this pull request?

Debugging RAM usage.

• Bug fix
• New Feature
• Documentation update
• Other

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.21%. Comparing base (8166a9e) to head (51b13a2).
Report is 2 commits behind head on develop.

Additional details and impacted files

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  Coverage    94.21%   94.21%           
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  Files           59       59           
  Lines         7259     7259           
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  Hits          6839     6839           
  Misses         420      420           

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[odudex]

Thank you Jean! Your indicator improvements will help answer these questions we all have.