* R/main.R(record): New entries: exact_mass, ion_mass, ce, adduct, rt,
base_peak, prec_int and ms2. Removed entry mass.

(line2entry): Fixed useless warning.

(line2subentry): New function. Search for VAL1, VAL2, ... in
"ENTRY: KEY VAL1 VAL2 ..." type of line.

(grab_line, greb_entry, grab_subentry): New functions simplifying
previous functionality.

Classify functions now name the groups by accession numbers.

R/main.R (classify_by_splash): New API function.

* R/main.R (classify_by_mz): New API function.