hippocampus adapted to spiking network

[zycyc]

• performance is steady (BigHip learning ~95 pairs)
• added correlation-based memory measures
• nogui consistent with gui results (could do factor run)
• using default learning algorithms except not using sigmoid on weights
• have the option to add Hebbian learning (currently 0)

[codecov[bot]]

Codecov Report

Patch coverage: 28.57% and project coverage change: -0.06 :warning:

Comparison is base (2dbfe20) 30.23% compared to head (03f5fdc) 30.18%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #269 +/- ## ========================================== - Coverage 30.23% 30.18% -0.06% ========================================== Files 79 80 +1 Lines 15186 15250 +64 ========================================== + Hits 4592 4603 +11 - Misses 10332 10385 +53 Partials 262 262 ``` | [Impacted Files](https://app.codecov.io/gh/emer/axon/pull/269?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=emer) | Coverage Δ | | |---|---|---| | [axon/gpu.go](https://app.codecov.io/gh/emer/axon/pull/269?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=emer#diff-YXhvbi9ncHUuZ28=) | `3.17% <ø> (ø)` | | | [axon/prjn.go](https://app.codecov.io/gh/emer/axon/pull/269?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=emer#diff-YXhvbi9wcmpuLmdv) | `60.86% <0.00%> (-0.34%)` | :arrow_down: | | [axon/prjntypes.go](https://app.codecov.io/gh/emer/axon/pull/269?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=emer#diff-YXhvbi9wcmpudHlwZXMuZ28=) | `0.00% <ø> (ø)` | | | [axon/prjntypes\_string.go](https://app.codecov.io/gh/emer/axon/pull/269?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=emer#diff-YXhvbi9wcmpudHlwZXNfc3RyaW5nLmdv) | `16.66% <ø> (ø)` | | | [axon/prjnparams.go](https://app.codecov.io/gh/emer/axon/pull/269?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=emer#diff-YXhvbi9wcmpucGFyYW1zLmdv) | `28.16% <21.53%> (-3.85%)` | :arrow_down: | | [axon/hip\_prjns.go](https://app.codecov.io/gh/emer/axon/pull/269?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=emer#diff-YXhvbi9oaXBfcHJqbnMuZ28=) | `80.00% <80.00%> (ø)` | |

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