lread.c (Vload_history): Enhance doc-string to say that the file is the

lread.c (Vload_history): Enhance doc-string to say that the file is the
absolute truename of the loaded file.

lread.c (Vafter_load_alist): doc-string: state that an element now has a
regexp to match file names, not a file name as such.

lread.c (readevalloop): Call file-truename on the name for load-history,
except at preloading time.

lread.c (Fload): At preloading time, preserve the extension of the
filename which goes into load-history.  New variable hist_file_name.

lread.c (Fload): Do eval-after-load stuff by calling the lisp function
do-after-load-evaluation.