Logistic GWAS model glm.fit messages

[Alice-MacQueen]

In pvdiv_gwas() when type = "logistic", bigstatsr::bigUnivLogRegr() can drop thousands of messages when it has to use glm.fit. This function is using a message2() function to send these messages so it isn't as simple as using suppressMessages() to silence these messages (and ideally replace them with only one message).

Figure out some way to silence these messages in pvdiv_gwas() and pvdiv_standard_gwas().