[RP] [PATCH] new command execf and execa

[Bernhard R. Link]

The attached patch adds two new functions, execf and execa.
The function execa starts a program anonymously, not remembering
the currently active frame, so that the windows of the program
do get placed in the frame active when the window is created.
The function execf is like exec, but it does not remember the
currently active frame, but gets a frame to place the windows
in as first argument

Hochachtungsvoll,
        Bernhard R. Link

execaf.diff
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