Normalize identifiers with versions

The resource finder should map identifiers 

+ MT834088
+ MT834088.1
+ MT834088.2
etc to the last permanent identifier. Currently only this one works:

http://covid19.genenetwork.org/resource/MT834088.1

Even though these 'permanent' identifiers are transferred to Arvados identifiers, I believe we should 
support this type of dereferencing to find the Arv id.

See also #103