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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)