Building excel plugin as shared library, added plugin.xml.
* Makefile.am: Building excel plugin as shared library, added plugin.xml. * boot.[ch]: xxx_debug variables from src/main.c moved here. Converted to real plugin with file_opener and file_saver services. * plugin.xml: New file. * gnumeric/plugins/excel/excel.h, plugins/excel/ms-chart.c, plugins/excel/ms-escher.c, plugins/excel/ms-excel-read.c, plugins/excel/ms-excel-read.h, plugins/excel/ms-excel-util.c, plugins/excel/ms-excel-write.c, plugins/excel/ms-excel-write.h, plugins/excel/ms-formula-read.c, plugins/excel/ms-formula-write.c, plugins/excel/ms-obj.c: Adjusted function signatures, don't return TRUE/FALSE if using IOContext (we don't need boolean value as IOContext now sets "error_occurred" flag).
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