unify macro names for setting motor positions and limits

[dschick]

currently the naming of the macros for setting the positions and limits for motors are not consistent and might have some historic links to SPEC.

positon: set_pos and set_user_pos
limits: set_lm and set_lim

I would suggest to introduce the following aliases:
set_dial_lim --> set_lm
set_user_lim --> set_lim
set_dial_pos --> set_pos
set_user_pos is okay

let me know what you think

[reszelaz]

Hi @dschick,

I personally like this idea. Let's see if there are other opinions.
Regarding the implementation I just checked and the following works:

class set_user_lim(set_lm):
    pass

Were you thinking about a different implementation?

[reszelaz]

BTW, there is this issue about the user and dial limits: #159. I'm not sure if what we wrote at that time is actually right. It would be good if you could comment there on the relations between the dial and user limits, as well as about the re-calculation of the limits whenever the position-related attributes (step_per_unit, offset, and sign) change.
Many thanks!