Export the data displayed in a grid, or the data contained by a table / cursor

Properties:
a) To export the data displayed in a grid (only the visible columns)
	Drop an instance of the exportxlsx class to your form and set :
	- grid=grid reference
	- label (optional)=the default file name; a reference to an object with the "caption" property; by default DATETIME()


b) To export the data contained in a table / cursor
	Drop an instance of the exportxlsx class to your form and set :
	- grid=table / cursor name
	- label (optional)=the default file name; a reference an object with the "caption" property; by default DATETIME()
	- cFields (optional)= list of fields to be displayed, separated by commas; by default all the fields are exported
	- cHeaders (optional)= list of field headers to be displayed, separated by commas; by default the field names


c) Formatting properties (right click)
	headbackcolor=back color for column headers (if >=0)
	headfontbold= .T./.F.
	headfontitalic= .T./.F.
	headfontname=if not empty and installed
	headfontsize=if>0
	headforecolor=font color for column headers (if >=0)

	rowbackcolor=back color for rows (if >=0)
	rowfontbold= .T./.F.
	rowfontitalic= .T./.F.
	rowfontname=if not empty and installed
	rowfontsize=if>0
	rowforecolor=font color for rows (if >=0)
	lMemoAsComment	optional When passed as .T., memo fields are converted into memo while the cell contains the word "memo"

d) Miscelaneous
	a) SheetName 
		character (default sheet1)
		public
		desired sheetname
	b) sheetFirstCol 
		character (default A)
		public
		start column
	c) sheetFirstRow 
		numeric (default 1)
		public
		start row
	d) lastcol
		character (XFD)
		public
		last valid column (maximum column / sheet)
	e) lastrow
		numeric (1048576)
		public
		last valid row (maximum number of rows / sheet)
	f) autocolw
		logical (default .F.)
		public
		.T. columns width are evaluated based on font size and the data type (the autosize feature)
	g) nCodePage
		numeric (default 0)
		public
		support for codpages for strings
		acceptable values: 437,620,737,850,852,857,861,865,866,874,895,932,936,949,950,1250,1251,1252,1253,1254,1255,1256 (see VFP help)
	h) lOpen
		logical (default .F.)
		public
		when .T. the document is open
	i) LangId
		Character (can be EN, RO,etc.)
		Public
		Default En
	j) aErrMess[7]
		Character array
		Public
		Error messages


support for more than 702 columns
stop the export after the row 1048576 and the column XFD
rows height depend on the font size
when memo columns are present, the row height depends on the number of CR (increase the row height according to the number of memo rows)
Comments boxes height and width are variable