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The default word size on launch is 64-bit, but for some reason
this was not matching up with equation.word_size. Now a call to
word_size_changed_cb() after switching to programming mode
will fix this so that the current word size is obvious to the user.

This may or may not be added -- I just created it in response
to #191 which requested it. Unfortunately our two current data
sources do not have BDT, so a static rate was the only easy
(immediate) solution.

Links to other articles probably need to be added, but I'm not sure
what and where.

This code breaks the unicode string down into UTF-8 bytes and
then inserts them into the equation display.

When using a word size less than 64 bit, it is misleading to have
the bit buttons larger than that bit size active. This patch
dims (de-sensitizes) the applicable bits so they cannot be toggled.
It also sets all bits larger than the word size to zero.

This feature adds a word size changer GtkMenuButton to
programming mode. It also changes the preferences menu for the
same option (word size) to use "bit" instead of "bits".

Remove obsolete keyboard instructions; Improve paragraph layout format.

Ref: #185

Replace 'e.g.' with 'such as'.

Ref: #185

Add subscript link to the keyboard page.

Ref: #185

Update usage instructions to specify the modes in which the superscript and
subscript buttons are available; Update grammar to be more consistent with
other help pages.

Ref: #185

Adds metric cups to the volume conversions.\n\nThe reason I did not use American cups is due to the relatively small difference between the sizes, especially due to it being a rough unit in the first place.\n\nMetric cups seem the most internationally agreed standard of this useful measurement

(cherry picked from commit 877faf67)

(cherry picked from commit 65e4a1f0)