Closes #60 invalid values for get_int_box on left-top tif border

[st-korn]

Sometimes, when box is over left or over top border of the tif, i_min or j_min were negative.
It causes zerro-range of array selected.
See issue #60

from geotiff import GeoTiff

def read_square(x,y):
    arr = gtf.read_box(((x-square_size//2, y+square_size//2), (x+square_size//2, y-square_size//2)))
    print(arr.shape)

gtf = GeoTiff("ASTGTMV003_N43E039_dem.tif", as_crs=3857)
box = gtf.tif_bBox_converted
square_size = min(box[1][0]-box[0][0], box[0][1]-box[1][1]) // 3
print(gtf.tif_bBox)
print(box, square_size)
# ((4341444.67989728, 5465463.676723338), (4452795.092771329, 5311950.706664268)) 37116.0

# Center
read_square((box[1][0]+box[0][0])//2, (box[0][1]+box[1][1])//2)
# (869, 1199) - OK

# Right
read_square(box[1][0], (box[0][1]+box[1][1])//2)
#(869, 600) - OK

# Right-bottom
read_square(box[1][0], box[1][1])
# (438, 600) - OK

# Bottom
read_square((box[1][0]+box[0][0])//2, box[1][1])
# (438, 1199) - OK

# Left-bottom
read_square(box[0][0], box[1][1])
# (438, 0) - ISSUE

# Left
read_square(box[0][0], (box[0][1]+box[1][1])//2)
#(869, 0) - ISSUE

# Left-top
read_square(box[0][0], box[0][1])
# (0, 0) - ISSUE

# Top
read_square((box[1][0]+box[0][0])//2, box[0][1])
# (0, 1199) - ISSUE

• I check i_min, j_min: if they are negative - I make them equal to zero.
• I check i_max, j_max of tif dimensions, and if they are greater - I make them equal to tif width or height. This is not necessary. Range is correct selected from array, wher its borders are greater than array's length.
• I check i_min, j_min of tif dimensions, and if they are greater - I raise BoundaryNotInTifError. Because the box is located outside tid file.
• I check i_max, j_max: if they are negative - I raise BoundaryNotInTifError. Because the box is located outside tid file.

I remove function _check_bound_in_tiff. It was called only from within get_int_box. Now get_int_box already contains all its functionality.

I tested code with mypy and use pre-commit for verification.