add more test spreadsheets for libmwaw

Change-Id: I8810b84d2675ba3695578b5ed87c32dd1a686ae9
add some test drawings/paintings for libmwaw

Change-Id: Id0f5aa7fbb92d15bbe877e85dd60b51107f49168
add some test documents for libwps

Change-Id: I20aa49212b6ecbb819c9671b5c144f294653ab47
move CppUnit plugin def. to separate source file

Change-Id: Id946419274728f96e1de41cffe84280e37e87ab3
add convenience functions to handle dirs

Change-Id: I81c94565e09e0d839d95bf4f09b029838bb37ad5
ensure writerperfect::DirectoryStream only works for dirs

Change-Id: I588d295d72a600710324ee936d0c2291872c1d73
add unit test for writerperfect::DirectoryStream

Change-Id: I53aaf2355d9f3071544ebcaaee01bd44a30f88fc
add more test drawings/paintings for libmwaw

Change-Id: I7a85c7b7eae2abf29ff1a5742e1218346b1f9e00