LMS-2462 import from Excel files

...ava/ch/systemsx/cisd/common/filesystem/FileUtilities.java

.../ch/systemsx/cisd/common/parser/DefaultLineTokenizer.java

...ce/java/ch/systemsx/cisd/common/parser/DefaultParser.java

.../java/ch/systemsx/cisd/common/parser/ExcelFileLoader.java

.../source/java/ch/systemsx/cisd/common/parser/ExcelRow.java

...ava/ch/systemsx/cisd/common/parser/ExcelRowTokenizer.java

...java/ch/systemsx/cisd/common/parser/HeaderLineFilter.java

common/source/java/ch/systemsx/cisd/common/parser/ILine.java

...e/java/ch/systemsx/cisd/common/parser/ILineTokenizer.java

...n/source/java/ch/systemsx/cisd/common/parser/IParser.java

common/source/java/ch/systemsx/cisd/common/parser/Line.java

.../java/ch/systemsx/cisd/common/parser/ParserUtilities.java

...ce/java/ch/systemsx/cisd/common/parser/TabFileLoader.java

...msx/cisd/common/parser/filter/AlwaysAcceptLineFilter.java

...ommon/parser/filter/ExcludeEmptyAndCommentLineFilter.java

...va/ch/systemsx/cisd/common/parser/filter/ILineFilter.java

...ystemsx/cisd/common/parser/filter/NonEmptyLineFilter.java

...ava/ch/systemsx/cisd/common/parser/DefaultParserTest.java

.../ch/systemsx/cisd/common/parser/HeaderLineFilterTest.java

...a/ch/systemsx/cisd/common/parser/ParserUtilitiesTest.java