New version of filex.c filex.h
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Mohammad's remarks have been taken mostly into account, and the code
was simultaneously reviewed to get some functions smaller :
* removal (or commented via #if 0 / #endif) of the function load_file
  and other unnecessary functions ;
* added the gal_filex prefix for external functions ;
* added the filex_ prefix for some (not all!) the internal functions;
* added the blank lines between functions, commented differently the
  functions (before and not just after the function name).
* limited length of lines to ~80 bytes. 

The visual aspects of commenting the functions is of course a matter
of taste and usage ; I was used to comment a function between its
name (declaration line) and the function body, which I still prefer:
it's more obvious to me to detail the role of the parameters after
their declaration than before. But I can adapt :-)

On the computers I tested, I did not get any error or warning; but
it does not mean there are none, since Mohammad reported warnings I
did not get.

There is a strange problem for the test #8 (sample query to asu-tsv),
for which I did not yet get an answer: the last decimal of a number
(the G flux) may change from query to query, being sometimes
8.1673e+01 or 8.1674e+01. I would be interested to know whether I'm
thr only one to get this problem...

# Sur la branche lib-intest
# Modifications qui seront validées :
#	modifié :         filex.c
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# Fichiers non suivis:
#	a.out
#	cmd
#	commits
#	filex
#	filex-noprefix.h
#	filex.c.tmp
#	float.c
#	m1-asu.bad
#	test1.c
#