loading: try unsuffixed files directly last.

In this patch we change the strategy for resolving unsuffixed
paths in load and @(load). In load, an unsuffixed name is
tried with a .tlo suffix, then .tl and only if those don't
resolve to a file it is tried as-is.  The previous order is
as-is, .tlo, .tl.  Similarly in @(load), but unsuffixed paths
are tried as .txr, then .tlo, then .tl.

The motivation for this is to avoid probing the filesystem
multiple times the optimized case that we care about: loading
.tlo files from Lisp.

* parser.c (open_txr_file): Rearrange the probing strategy.
Also recognize .txr_profile as a suffix, treating it like .tl.
This is so that we don't probe for .txr_profile.tlo and
.txr_profile.tl before finding the profile.
(load_rcfile): Take advantage of the new path-not-found
exception. We avoid wastefully checking with path-exists-p
to avoid calling open_txr_file. We just let open_txr_file
throw an exception if the file doesn't exist, and then
distinguish the non-existence case in the handler.

* txr.1: Updated @(load) and load documentation.

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