Resolve "import of serology data"

Closes #335 (closed), #336 (closed)

added Covid-19 enhancement labels

added 6 commits

• fe0fc305 - date of virus collection is added automatically from redcap
• 19c55285 - iga/igg status is imported from redcap
• f0dabbe5 - filtering by serology added
• 75cb53ff - sorting by virus test refactored to use regex for visit match
• b4967fca - virus data are filled in loop instead of copy paste
• ca62b153 - filtering by virus tests refactored copy-paste replaced with regexp

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added 1 commit

• d3f85fa4 - handle null values properly

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added 1 commit

• 77b5c140 - serology tests can be exported to mail template

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added 2 commits

• 6382d9ec - variable names unified
• a074fd8d - health partner information is available in subject templates

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unmarked as a Work In Progress

assigned to @carlos.vega

changed the description

mentioned in commit 3142d900

merged