still be in order), support abbreviated field names:
(nxt_sel, nxt_idx, nxtfld, ca4fld): Remove.
(nflds, fldca, fldidx, caflds, getfld): New.
(xundump): Initialize and finalize them.
(xundump1): New, factored out of xundump().
(deffld): Match names, record field order in fldca[], fldidx[] for
getfld(). Use caflds[] to detect duplicates.
(xufldname): Catch negative index. Used to pass it to deffld(), which
now interprets it as no index.
(setnum, setstr, setsym, mtsymset, add2symset): Use getfld().
(xufld): Improve error message.
(setstr): Fix for NULL strings.
(xuheader): Catch null ef_cadef().
(xuheader): Don't oops when an unexpected table can't be undumped.
leaks memory; rework it:
(deffld): New; semantic action for field headers.
(xufldname): Use it instead of storing a value for xucolumnheader().
(xucolumnheader): Remove, use xuflds() directly instead.
(setnum, setstr, setsym): New; semantic actions for field values.
(xufld): Use it instead of storing a value for xuloadrow().
(xuloadrow): Remove. Was incomplete.
(xufldname, xufld, xuflds): Remove parameter values. Callers
changed.
(cur_type, cur_obj, nxt_sel, nxt_idx, nxtfld, ca4fld, getsymtab): New
helpers.
(xundump): Initialize them.
(enum_value, value, freeflds, xunsymbol): Remove.
(mtsymset, add2symset): New.
(xufld): Use them to build a symbol set along the parse.
(xufldname, xufld, xuheader, xutrailer, xundump): Increment lineno
when and only when a linefeed is consumed, to make sure it is correct.
Move some semantic checks so that errors get reported for the correct
line.
(xundump): Use compare filenames as pointers, not strings, when
checking whether to reset lineno.
(xundump): Keep empfile[type] consistent during parse, to make
ef_ptr() usable.
(xundump): Don't call ep->init() on sentinels.
(xuinitrow): Unused, remove.
needed for xdump, because it doesn't occur as ca_table.
(lost_ca): Remove selector uid. Reasons as for realm_ca. The value
is incorrect in unused records, which is semantically tolerable, but
needlessly complicated to check in ef_verify.c.
(news_ca): Remove selector uid. Reasons as for realm_ca, plus the
value is incorrect, because nws_uid is not used.
