Defined in tcl/intranet-defs.tclProc for building an entire url.
To replace export_url_vars, used in a similar manner
The main difference is that this proc accepts the stub
as the first argument, and prepends either a ? or &
to each variable as necessary. If the first argument
is null, then the returned value is equivalent to
that which is returned by export_url_vars.
Usage: build_url stubvar argvar1 argvar2 argvar3 ...
OR build_url "literalstub" argvar1 argvar2 argvar3 ...
Usage backwards-compatible with export_url_vars:
build_url "" argvar1 argvar2 argvar3 ...