Check relInt function in HRMS

[jsaintvanne]

We were working to add a ndigit parameter for HRMS but the RelInt function use this :

 common.masses <- pat[pat[, 1] %in% refpat[, 1], 1]
    expI <- pat[pat[, 1] %in% refpat[, 1], 2]
    DBI <- refpat[refpat[, 1] %in% pat[, 1], 2]

This compare exact masses but in HRMS it could be better with a mass tolerance deviation maybe ?

[jsaintvanne]

This close PR could help to add ndigit param #29