Addd tests for columns and xls data structures
Addd tests for columns and xls data structures

sounay/flaminggo-test,ehealthafrica-ci/onadata,ultimateprogramer/formhub,SEL-Columbia/formhub,jomolinare/kobocat,wesley1001/formhub,kobotoolbox/kobocat,ultimateprogramer/formhub,hnjamba/onaclone,ehealthafrica-ci/onadata,piqoni/onadata,smn/onadata,jomolinare/kobocat,ehealthafrica-ci/onadata,jomolinare/kobocat,spatialdev/onadata,smn/onadata,makinacorpus/formhub,SEL-Columbia/formhub,awemulya/fieldsight-kobocat,mainakibui/kobocat,makinacorpus/formhub,eHealthAfrica/formhub,eHealthAfrica/onadata,wesley1001/formhub,GeoODK/onadata,sounay/flaminggo-test,eHealthAfrica/formhub,spatialdev/onadata,piqoni/onadata,eHealthAfrica/formhub,wesley1001/formhub,qlands/onadata,awemulya/fieldsight-kobocat,qlands/onadata,GeoODK/formhub,GeoODK/onadata,GeoODK/onadata,awemulya/fieldsight-kobocat,ehealthafrica-ci/formhub,SEL-Columbia/formhub,spatialdev/onadata,makinacorpus/formhub,mainakibui/kobocat,sounay/flaminggo-test,hnjamba/onaclone,ehealthafrica-ci/formhub,piqoni/onadata,ehealthafrica-ci/formhub,mainakibui/kobocat,makinacorpus/formhub,ehealthafrica-ci/onadata,wesley1001/formhub,GeoODK/formhub,piqoni/onadata,SEL-Columbia/formhub,eHealthAfrica/onadata,hnjamba/onaclone,awemulya/fieldsight-kobocat,jomolinare/kobocat,sounay/flaminggo-test,GeoODK/formhub,mainakibui/kobocat,smn/onadata,spatialdev/onadata,ultimateprogramer/formhub,hnjamba/onaclone,ehealthafrica-ci/formhub,smn/onadata,eHealthAfrica/onadata,eHealthAfrica/formhub,ultimateprogramer/formhub,qlands/onadata,kobotoolbox/kobocat,kobotoolbox/kobocat,kobotoolbox/kobocat,GeoODK/onadata,qlands/onadata