Oncoprinter doesn't support numerical IDs

[alisman]

Use reported that the following input breaks oncoprinter. (alterations don't align with samples).

The bug is that we don't support numerical IDs for some reason. This should be fixed.

1   EGFR    E746_A750del    INFRAME
2           
3           
4   KRAS    G12C    missense
5   EGFR    E709_T710delinsD    INFRAME
6
7
8
9   EGFR    L858R   missense
10  PIK3CA  E545K   missense
11          
12  EGFR    E746_A750del    INFRAME
13  EGFR    E746_A750del    INFRAME
14  BRCA2   D762Afs*5   TRUNC
14  PIK3CA  H1047R  missense
15  PIK3CA  H1047R  missense
16  EGFR    E746_A750del    INFRAME
17  KRAS    G12S    missense