Fitnesse tables fixes + createAuction()

Documentation/Fitnessee_Tables.md

...roject/src/main/java/exceptions/DateInvalidException.java

...ct/src/main/java/exceptions/ItemNonExistentException.java

...oject/src/main/java/exceptions/PriceInvalidException.java

...eProject/src/test/java/fitNesseFixture/SellerFixture.java

FitNesse/FitNesseRoot/20191120142128.zip

FitNesse/FitNesseRoot/20191120142319.zip

FitNesse/FitNesseRoot/20191121161352.zip

FitNesse/FitNesseRoot/20191121161352~1.zip

FitNesse/FitNesseRoot/RecentChanges.wiki

FitNesse/FitNesseRoot/RerunLastFailures.wiki

FitNesse/FitNesseRoot/clar.wiki

...sseRoot/files/testResults/clar/20191121161356_0_1_0_0.xml

...sseRoot/files/testResults/clar/20191121161639_0_1_0_0.xml

...sseRoot/files/testResults/clar/20191121162121_0_1_0_0.xml