reporting: change option names to camelCase

doc/dynare.texi

matlab/reports/@graph/graph.m

matlab/reports/@graph/write.m

matlab/reports/@graph/writeGraphFile.m

matlab/reports/@report/compile.m

matlab/reports/@report/report.m

matlab/reports/@report/write.m

matlab/reports/@report_series/report_series.m

matlab/reports/@report_series/writeSeriesForGraph.m

matlab/reports/@report_table/report_table.m

matlab/reports/@report_table/write.m

matlab/reports/@report_table/writeTableFile.m