st: Variables loop and deletion under certain conditions

[daniel klein <klein.daniel.81@googlemail.com>]

Eric already answerd the "why" it does not work. The solution proposed
by Chris should work. Erics solution (although it is more an example)
can be modified, because it will fail if the loop contains numeric
variables. I do not know whether skipping numeric variables will
additionally saves some execution time.

---code revised---
foreach varname of varlist v*{
        cap conf str v `v'
        if _rc continue
	if `varname'[5]=="#ERROR" drop `varname'
}
---end---

Best
Daniel
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