This reverts commit deec83a4ee.
Reverting because supporting non-standard or arbitrary baud rates is
troublesome because the c library provides no means of doing so and even
if bare metal linux kernel interface is used it will not work on all
Linux kernels version.
Rearranged the key commands:
ctrl-c (clear screen) is now
ctrl-l which is similar to the well known shell ctrl-l
ctrl-i (show settings information) is now
ctrl-c (show configuration)
Updated man page accordingly.
Only enabled when possible, that is, when the BOTHER definition is
available.
It is untested but it should work as described here:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=683826
Some Cypress USB<->serial devices supposedly supports arbitrary speeds.
Support a single source of baud rate configuration as discussed in
https://github.com/tio/tio/issues/45 .
To do so, autogeneration of the switch cases which do the baud rate
option value check and configuration/conversion in tty_configure() is
introduced via a single macro.
Just to be safe, this change also enables configure detection of all
baud rates, including the ones previously assumed supported by most/all
systems (POSIX).
Various platforms supports different baud rates.
To avoid adding platform specific handling generic baud rate detection
tests are introduced in the configure script. Successfully detected baud
rates are automatically enabled. This applies to both the C code and the
bash completion script.
Note:
Baud rates below 57600 are defined by POSIX-1 and supported by most
platforms so only baud rate 57600 and above are tested.
