jobchainlink: catch multiple objects returned
linkTaskManagerChoice: fix choice creation
linkTaskManagerChoice: fix variable names
linkTaskManagerChoice: look up description properly
unit: import needed models
jobChainLink: handle no MSCLs found
jobChainLink: return correct UUID
unit: add missing imports
unit: needs unitFile
unitFile: does not need to subclass unit

unitFile uses none of the inherited properties or methods from unit,
and will probably not in the future, so there's no need for it to
inherit.
unitFile: don't import unit
linkTaskManagerFiles: fix variable reference
ltmFiles: fix instance variables
linkTaskManagerFiles: arguments is an instance variable
ltmAssignMagicLink: fix missing import
models: fix replaces column name
unitTransfer: remember to assign variable!
ltmReplacementDic: flip enumerate() variable order
jobChainLink: move comment
ltmFiles: catch multiple objects returned