st: graph bar multiple-line labels odd behavior when label includes operator

[dr kardos laszlo <l_kardos@chello.hu>]

dear listers,

easier to show than to explain, so please consider:

sysuse auto, clear
gr bar (mean) price, over(foreign, relabel(1 `""non-foreign" "cars""' 2 
`""foreign" "cars""'))

which works fine. but once you do this:

la def origin 0 `""non-foreign" "cars""', modify

and then retry gr bar... either exactly as above or without the 
-relabel()- suboption, it will stop with an error message, even though 
-la def- specified the very same label as -relabel- did.

what i have found so far by trying around is that the error can be 
triggered by including an arithmetic, logical, or relational operator in 
the label definition as above, with the exception of ~ and !.

the issue, however, only exists if we define a multiple-line label with 
double quotes and compound double quotes arranged accordingly, and 
disappears once we redefine the label again to exclude all operators.

versions 10 to 12 all seem affected (issue been around for years; no 
search hits though), at least in a 64-bit windows 7 environment i am 
blessed with here.

surely this is something unintended and will hopefully be resolved in an 
upcoming update.

regards, laszlo
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