fix install/build instructions for Windows

This was recently done by somebody and that is the information
that was missing.
structure the Windows notes better
link to wiki for Windows instructions
Perform file locking on win32

The functions _insert_bytes_no_mmap and _delete_bytes_no_mmap call
mutagen.util.lock, which in turn uses the fnctl module which isn't
available on Windows.
Prevent duplicate record labels in tags.

Picard receives Labels/Catalog Number pairs and separates these into
different tags. Where a two catalog numbers are from the same Label, the
label gets duplicated in the label tag, and this fix prevents that.
Prevent duplicate catalog numbers in tags

There are examples in MB database of two label/catalog numbers where
labels are different but catalog numbers are the same. Since these are
is stored in separate tags, this fix avoid duplicate catalog numbers.
Use SSL for personal data

Currently only user name/password is encrypted using HTTP basic
encryption, but user's personal data (e.g. collections) is not
encrypted.

It is now generally accepted that all personal data should be encrypted,
and this fix applies encryption to any mblogin network requests (which
implies personal data is being loaded / saved).
Address bitmap review comment 1

This is definitely nicer code.
Address bitmap comments

Add MUSICBRAINZ_SERVERS constant and use this in options/general and to
decide SSL for mblogin webservice.
Show total rather than max

Unsure why previous code showed max of queued and active rather than the
total of the two.
Address comments

Reduce down to one counter variable.
Eliminate decrement at unqueue/increment at start request
Update counter emit aligned with counter increment/decrement.
Set compilation based only on VA
shorter Windows build instructions
explain sudo
add chromaprint to optional dependencies
Add missing tag names
Rename compilations tag
Add NEWS.txt update.
Address Michael's comment
Move decrement to end of request processing...

... to avoid counter going to zero and then up again.