Incorrectly plotted Alt-Az grid

[gr22]

• The grid line has a wrong curve near the pole when using Alt Az grid and a julian_date
• The AZ ticks have a curly bracket displaying before the ' sing

This is the chart file:

 CHART
coords=ra_dec
angular_width=15
projection=stereographic
julian_date=2461249
ra_central=0
dec_central=90
constellation_boundaries=0
plot_dso=0
width=21
plot_stars=1
dso_symbol_key=0
show_grid_lines=1
grid_coords=alt_az
great_circle_key=0
great_circle_dotted=0
magnitude_key=0
output_filename=/tmp/test.pdf