strip now-unnecessary prefix from frog functions

[codecov-commenter]

Codecov Report

Base: 84.36% // Head: 84.36% // No change to project coverage :thumbsup:

Coverage data is based on head (3f450ce) compared to base (6627f81). Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #47 +/- ## ======================================= Coverage 84.36% 84.36% ======================================= Files 16 16 Lines 582 582 ======================================= Hits 491 491 Misses 91 91 ``` | [Impacted Files](https://codecov.io/gh/LCSB-BioCore/FBCModelTests.jl/pull/47?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=LCSB-BioCore) | Coverage Δ | | |---|---|---| | [src/frog/frontend.jl](https://codecov.io/gh/LCSB-BioCore/FBCModelTests.jl/pull/47/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=LCSB-BioCore#diff-c3JjL2Zyb2cvZnJvbnRlbmQuamw=) | `88.23% <100.00%> (ø)` | | | [src/frog/io.jl](https://codecov.io/gh/LCSB-BioCore/FBCModelTests.jl/pull/47/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=LCSB-BioCore#diff-c3JjL2Zyb2cvaW8uamw=) | `100.00% <100.00%> (ø)` | | | [src/frog/report.jl](https://codecov.io/gh/LCSB-BioCore/FBCModelTests.jl/pull/47/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=LCSB-BioCore#diff-c3JjL2Zyb2cvcmVwb3J0Lmps) | `88.33% <100.00%> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=LCSB-BioCore). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=LCSB-BioCore)

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[exaexa]

true, it's not