According to the documentation, if the second or third line in a
script starts with %%!, then escript will use the rest of the line
as emulator options.  However, previously this was only the case
if the first line started with #!.  This change removes that check,
and unconditionally uses the %%! line if present.

Expect modifications, additions and corrections.

There is a kludge in file_io_server and
erl_scan:continuation_location() that's not so pleasing.

When correcting OTP-10071, a new error was introduced in
erl_prim_loader. In order to improve ability to detect if a file was
inside the primary archive, all paths were flattened - i.e. "."  and
".." were removed. This implementation had some faults, and it did not
take symlinks into account. This has been corrected.

* ta/prim_archive-reloading:
  escript_SUITE: remove gratuitous space
  [erts,kernel,stdlib] fix escript/primary archive reloading

Conflicts:
	erts/preloaded/src/erl_prim_loader.erl

OTP-10151

Thanks to Tuncer Ayaz for co-authoring.

If the mtime of an escript/primary archive file changes after being
added to the code path, correctly reload the archive and update the
cache.

The existing code didn't consider that it might be a zip archive and failed:

    =ERROR REPORT==== 3-Aug-2011::09:21:21 ===
    File operation error: bad_central_directory. Target:
    /escript_archive/module.beam. Function: get_file. Process: code_server.

Thanks David Reid and Hakan Mattson.

Check buffer operations on input from escripts, the command line and
environment variables.