appa-55ii: Don't use _t suffix for a typedef.

Names ending with _t are reserved for POSIX.

http://pubs.opengroup.org/onlinepubs/9699919799/functions/V2_chap02.html
(last line in table 2)
asix-sigma: fix incorrect pointer cast (non-aligned memory and endiannes issue)

This fixes the following warning:

asix-sigma.c: In function 'receive_data':
asix-sigma.c:1064:4: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
    devc->state.lastts = *(uint16_t *) buf - 1;
    ^
rigol-ds: Rename and document some confusingly named variables.
rigol-ds: Use rigol_ds_channel_start() function for legacy protocol too.
rigol-ds: Unify code for counting expected incoming bytes.
rigol-ds: Unify partial read handling.
rigol-ds: Select channels before issuing RUN command.
rigol-ds: Use set_cfg wrapper for capture setup commands.
rigol-ds: Use correct analog frame size for VS5000 series.
rigol-ds: Fix rigol_ds_channel_start() for digital channels.
Add config keys for upcoming RF demodulator drivers.

Langford driver will be first.
scpi: Log IDN? result.
rigol-ds: Add support for Agilent DSO1014A.
rigol-ds: Use correct live waveform size for Agilent DSO1000 series.
rigol-ds: Support 4 analog channels.
rigol-ds: Support the rest of the DSO1000 range.
Add udev rule for Agilent DSO1000 series.
Revise SCPI read API to allow backend-independent data handling.
Skip analog probes in logic-only output formats.
Add config keys for setting the number of analog probes.

This is primarily of use in the demo driver, but this patch also
takes in the logic probe setting config key used only by the
session driver so far.