header tag differs between runs

[matthdsm]

Hi
This is a minor issue but it seems the order of the tags in the header changes between 2 runs of elprep filter.
This causes the md5sum to be different when comparing tests. Could you sort the tags so the order stays the same?

Thanks
M

matdsmet:tmpqdm3s0ro $ diff 61/b91ed7ecaa51be82e9859e6ca0bcc4/test.sam a9/8bbdf3f2b5b85947daab90527d4e47/test.sam
1c1
< @HD   SO:coordinate   VN:1.6
---
> @HD   VN:1.6  SO:coordinate
3c3
< @RG   ID:1    PU:1    SM:testN        LB:testN     PL:illumina
---
> @RG   LB:testN        PL:illumina     ID:1    PU:1 SM:testN

[caherzee]

I have changed it so header tags are always sorted alphabetically. Can you let me know if this is ok?

Thanks!

[matthdsm]

Thanks, I'll build from source and give you a ping once it's tested!