SOLUTION/EPOCHS missing from SINEX output

[aclel]

Describe the bug
SOLUTION/EPOCHS is a mandatory block in a SINEX file. The output SINEX does not contain this block.

To Reproduce
Steps to reproduce the behavior:

1. Run any example with sinex output set to true
2. Open SNX file in the outputs

Expected behavior
SOLUTION/EPOCHS block should be present, as per spec: https://ivscc.gsfc.nasa.gov/products-data/sinex_v202.pdf

Configuration files
Any example file with sinex output set to true:

outputs:
    sinex:
        output:                     true
        filename:                   SINEX.SNX

Desktop (please complete the following information):

• OS: Linux (Docker)
• Version of Ginan: HEAD release-v2.1.0-3e8e41e-dirty

Additional context
I tried to use an output SINEX file in DynAdjust as an experiment, but it failed due to the missing EPOCHS block.

SOLUTION/EPOCHS block has 0 sites
SOLUTION/ESTIMATE block contains additional sites not listed in SOLUTION/EPOCHS