1.3.1-rc.1+ change to Boron solar charging (via VUSB) behavior

Hardware
5

@ScruffR @Rftop We do have plans to introduce an option to disable system power manager and let the user application control the PMIC on its own completely, however not in 1.4.0. System power manager will be interfering with and overriding settings the application might be setting and it has been doing so since the introduction of this feature unfortunately.

As a workaround I may suggest trying to disable the interrupt for LOW_BAT_UC:

void setup() {
    detachInterrupt(LOW_BAT_UC);
    // Delay for up to two system power manager loop invocations
    delay(2000);
    // Change PMIC settings
    PMIC pmic;
    pmic.setInputVoltageLimit(4640);
}

This might be needed to be executed after waking from STOP mode sleep as well.

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