MSExcel: Color filtering of data.

[jornfranke]

Business that collect a lot of data in different structures (forms etc.) in Excel use often colors to indicate which cells represents columns and which cells data. This enhancement proposes to extract the data frame column names and the data itself based on the cell background color in Excel. It could be configured as follows (Numbers are ARGB codes):

• hadoopoffice.read.header.color=10,20,30,40

• hadoopoffice.read.data.color=9,19,29,39

• hadoopoffice.write.header.color=10,20,30,40

• hadoopoffice.write.data.color=9,19,29,39

Related to: https://github.com/ZuInnoTe/hadoopoffice/issues/55

[jornfranke]

target version hadoop office 1.4.0