introduce SEP=: instead of hard-coded : (issues #31)

[jeonghanlee]

Pre-discussion at issues #31

@anjohnson

Please review changes in all template files. It doesn't change any others db files from community substitution files. At ESS, I've create the iocAdminSoft-ess.sustitutions in separated repository (e3-iocStats)

This changes give us to use the our own naming conventions strictly.

@MarkRivers

I am sorry about not changing any opi screens, since these changes allow me to follow the ESS naming conventions with the customized ess substitutions file. Once ESS have "bob" screen, I will update it.

[anjohnson]

I haven't actually tested it but this looks Okay to me, replacing all : separators in the PV names with a macro $(SEP=:) that defaults to : if no value is provided for it. Of course accepting this change affects any other PRs that add new PVs (such as #30) since their names would need modifying to match.

[mark0n]

I'll update #30 as soon as this one is merged.

[bhill-slac]

Looks like a useful change for those who don't use : in their naming scheme.
I've tested and it works for me.
See https://github.com/bhill-slac/iocStats/tree/preserve-SEP
for a branch which uses $(SEP=:) in iocQueue.db and some other records that are new.
It also modifies the substitutions files to preserve the SEP=: default till dbLoad time
which may allow Jeong to use the default iocAdminSoft.substitutions file.