rvn_rvp_fill_template adds extra 0s in mac

[rchlumsk]

The padding of text seems to not work properly in mac compiled RavenR package. Example output in filled rvp file below

`:LandUseClasses
:Attributes, IMPERM, FOREST_COV,
:Units, frac, frac,
0000000WETLAND, 000000000000.0, 00000000000000,
000000CROPLAND, 000000000000.0, 00000000000000,
00000000FOREST, 000000000000.0, 00000000000000,
0000000000LAKE, 000000000000.0, 00000000000000,
000000000WATER, 000000000000.0, 00000000000000,
00000GRASSLAND, 000000000000.0, 00000000000000,
00000SHRUBLAND, 000000000000.0, 00000000000000,
000000000URBAN, 000000000000.0, 00000000000000,
:EndLandUseClasses

#-----------------------------------------------------------------

Vegetation Classes

#-----------------------------------------------------------------
:VegetationClasses
:Attributes, MAX_HT, MAX_LAI, MAX_LEAF_COND,
:Units, m, none, mm_per_s,
00000000NO_VEG, 00000000000025, 00000000000006, 000000000005.3,
0000000000CROP, 00000000000025, 00000000000006, 000000000005.3,
00000000FOREST, 00000000000025, 00000000000006, 000000000005.3,
0000000000LAKE, 00000000000025, 00000000000006, 000000000005.3,
000000000GRASS, 00000000000025, 00000000000006, 000000000005.3,
:EndVegetationClasses
`