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The appup instruction 'delete_module' would cause a crash during
upgrade if the module to be deleted was not loaded. The reason was
that the release_handler tried to read the version number of the old
module after the code path had changed to point to the new version of
the application. Thus, if the module had not been loaded before the
upgrade, there would no longer be any such module in the path
(delete_module indicates that the module is deleted from the new
version of the application).
This is corrected by letting the release_handler read the old version
of the module only if the module is updated - not if it is
removed. And it is always read before the code path is changed.
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If a new version of an application did not include any erlang module
changes, the code path of the application was not updasted unless a
'load_object_code' instruction was added for the application. This
would be a problem if e.g. only some files in the priv dir were
changed, since calls to code:lib_dir or code:priv_dir would then point
to the old location of the application. This has been corrected - now
code:replace_path/2 will be called for all applications that are
changed (i.e. when the application's vsn is changed in the .rel file).
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This commit adds test cases from release_handler_SUITE on windows,
including some corrections in erlsrv and release_handler.
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