There turned out to be one blocking technical issue for full adpotion of
tpa format, and that was the fact that the printed representation of
floating values inside the tpa file might not reproduce the same double
when read. This change therefore introduces the "hexact" floating point
format, based on the the %La format string, which produces a hex
representation with exact round trips. While working on this, it was
convenient to add a new representation "compact" which is basically the
shorter of decimal and scientific representations, without trailing zeros.
This is now the default float format, but of course one can select decimal
or scientific formats to restore prior appearance. However, full-precision
compact format is now the (only) format for editing cell contents, as it
is accurate and efficient. Of course you can enter floating point values
in any format you like when typing in a formula.
The addition of several new floating point options overloaded the menus
in terminal teapot, so this change also revamps those menus slightly,
including eliminating the unused MenuChoice struct, and just specifying menus
with an array of strings.
Closes#63.
96079b210e
