Fix documentation string for caf
acmg report only needed by germline plans, not somatic plans
dbsnp af is reported as ratio, not percent
merged reports don't have plan or legend files
Merge pull request #300 from apregier/change_cle_plans

acmg report only needed by germline plans, not somatic plans
Merge pull request #299 from apregier/fix_caf_doc

Fix documentation string for caf